(NewsNation) — Progressive Abdul El-Sayed is taking on Rep. Haley Stevens, D-Mich., in the latest showdown between progressive and establishment Democrats this primary season.

The primary has become one of the clearest tests yet of where Democratic voters want their party to go. El-Sayed, a progressive backed by Sen. Bernie Sanders and other leaders on the party's left, has run against much of the Democratic establishment.

 Michigan officially has a state duck 

Stevens, a four-term congresswoman backed by Senate Democratic leader Chuck Schumer and many of Michigan's top Democrats, has made electability and experience central to her case.

The stakes extend well beyond the primary. The nominee will need to bring a fractured Democratic coalition back together to defeat Republican Mike Rogers in November and hold an open seat that is critical to the party's hopes of taking control of the Senate next year.

The winner will take on Republican Mike Rogers in the general election, who is unopposed in the primary. Polls close at 9 pm. ET.

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